The RPV/CPV are wall mount pressure ports used in conjunction with a low-pressure transmitter to measure room pressure. The RPV is also suitable for ceiling mount. Both are sized to mount directly to a 2” x 4” electrical box or they can be mounted directly to the wall. The OPV is an outdoor mountable pressure port and used in conjunction with a low-pressure transmitter to measure building pressure. The OPV has an integrated windshield which significantly reduces pressure fluctuations caused by wind gusts. Barbed fittings are provided for connection to the low-pressure transmitter with pneumatic tubing.